My experience maggie, is that almost the only TV that will work for you is the Panasonic, which has a clever system that allows headphones AND ordinary sound for your family.
Donny's link does take you to a 'deaf aid' place which says that NO TV works this way - this is wrong. But their alternatives are a bit cumbersome, requiring you to plug something into a scart socket on the TV, which sends sound to your separate headphones.
Probably simpler to buy a Panasonic for a few hundred quid - I'm sure you're due a new set(!)
Buenchico will be along later (hopefully) to tell us an easy/cheap way round the problem.
We got rid of our Panasonic and bought a Samsung, which doesn't have the separate headphone facility - our solution was to install a sound system so that we have speakers much nearer to our ears - saves having to turn the TV right up.
It IS a problem, particularly if you care for your neighbours and/or family.
BB